His work is in the collections of: Phillips Collection, The Whitney Museum of American Art, The Metropolitan Museum of Art, The Brooklyn Museum, Columbus Museum of Art, Addison Gallery of American Art, Dallas Museum of Art, Museum of Modern Art, The Newark Museum and The Corcoran Gallery.
At the time of his first one-man show in 1927 a critic for the New York Sun was surprised Hirsch had not been given one before. His work stood out when it was exhibited and was collected widely, this critic wrote. He said it was modern but not revolutionary and its quality was undisputed. Hirsch's subjects at this time were mainly buildings: structures without human presence. Critics described his paintings as cool, reserved, and somewhat aloof. The critic for the Sun said they showed "a moment when everything stops. Their design was flat. The colors were muted and harmonious with a "purity and clarity of color like things painted on porcelain or silk."They possessed an "intellectual austerity" but were nonetheless said to convey the essential character of a scene.
Hirsch's drawing, House, of 1920 shows some influences of Cézanne and the cubists in its juxtaposed panels and emphasis on the two-dimensional surface of the paper. Its spare, geometric design was typical of his style during this decade. His painting, Lower Manhattan, of either 1920 or 1921, is one of his best known pieces. It possesses the "essential flatness" of most of his output and shows his artistic skill in its overall design, coloration and balanced tonal relation.
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